Step 1:

The function is and .

Consider .

Rewrite the above integral.

Use integration by parts : .

Assume and

and

Substitute , , and in .

                     equation (1)

Now consider .

Use integration by parts : .

Assume and

and

Substitute , , and in .

Substitute  in equation (1).

.

Step 2:

Therefore .

Condition is .

Substitute in .

Convert radians into degrees.

Step 3:

Find .

Substitute and in .

Solution :

.

.